Update to 5.7.8-rc

Author: tianon

5.7/Dockerfile

@@ -14,7 +14,7 @@ RUN apt-get update && apt-get install -y perl --no-install-recommends && rm -rf
 RUN apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys A4A9406876FCBD3C456770C88C718D3B5072E1F5
 
 ENV MYSQL_MAJOR 5.7
-ENV MYSQL_VERSION 5.7.7-rc
+ENV MYSQL_VERSION 5.7.8-rc
 
 RUN echo "deb http://repo.mysql.com/apt/debian/ wheezy mysql-${MYSQL_MAJOR}-dmr" > /etc/apt/sources.list.d/mysql.list